The silly trick blip uses involves pinging non-encrypted HTTP web servers, which is not allowed from an encrypted web page. So you really have to load blip from a non-encrypted server.
This code is from 10 years ago. Most likely we could find some way to work with HTTPS nowadays, but alas, I don't have time to maintain it.
I recently upgraded to a Mac Studio with 10GBase-T and was experiencing regular SSH disconnections. Blip allowed me to isolate this to some sort of sporadic incompatibility with the 10GBase-T SFP+ modules I used in my Ubiquiti switch (despite having tried two brands of SFP+). Switching to a switch with native 10GBase-T ports (Zyxel XGS1250-12, only £225) fixed this.
The multiple ring buffer timescales is genius!
The blue ticks actually don't work, though. They're always accompanied by red and seem to be timing out instead of the usual exceptions.